Serial Port Communication with ASCII string

Hello everyone,

I am trying to connect to CL200A Konica Minolta luxmeter. The communication specification manual states that i should send to the instrument

as an ASCII string the following command: [STX]+"00541 "+[ETX]+[BCC="13"]+[DELIMITER]

The HEX equivalents are

STX -> 02

00541 -> 30 30 35 34 31 20 20 20 (After the 00541 there are 3 space characters.)

ETX -> 03

BCC -> 31 33

The Delimiter for the luxmeter is CR/LF. How do i write this command in Matlab?

Do i use fprintf or some other function?

Thank you!

Answer 1

[Walter Roberson]

fprintf(device, '%c00541   %c13\r\n', 2, 3)

is one of the ways.

For efficiency I would sprintf it to a character vector and then fwrite() that to the device if this is being invoked in a loop.

[Vaggelis Madias]

MATLAB displays this msg: "Error using serial/fprintf MODE must be either 'sync' and 'async' "

[Walter Roberson]

fprintf(device, '%c00541   %c13\r\n', [2, 3])

But what I would do instead is

S = sprint('%c00541   %c13\r\n', [2, 3]);

fwrite(device, S)

Or I might use

S = sprintf('\00200541   \00313\r\n')

or

S = sprintf('\x0200541   \x0313\r\n');

Using the %c version makes it easier to distinguish the characters to be converted from the fixed text.

[Vaggelis Madias]

Thank you very much! It worked!

[dralp]

Hello, thank you both for asking and responding to the question.

I'm trying to connect and read data from Konica Minolta T10a illuminance meter and CL500A spectroradiometer. To read date from T-10a, the technical note says use:

STX + receptor head (01) + command (10) + parameter + ETX + BCC + CR + LF

Parameters are: Hold 0=run 1=hold + CCF 2=disable 3=enable + Range 0=auto + 0

So for hold=run, CCF=disabled, range=auto, that should be something like this:

dataIN="\00201100200\00301\r\n";
writeline(s,dataIN)
dataOUT = readline(s);

But I get this error message:

Warning: The specified amount of data was not returned within the Timeout period for 'readline'.
'serialport' unable to read any data. For more information on possible reasons, see serialport Read Warnings. 

Any ideas?

Thank you,